Abstract
Absorption, emission and excitation spectra of KCl:Pb and KBr:Pb have been measured at various temperatures. These observed spectra are similar to those of KCl:Tl, and the absorption bands seemed to be due to transitions in Pb ++ ions which occupies the normal positive ion sites. The two principal excited states are 1 P 1 and 3 P 1 of Pb ++ ion. 273 mµ absorption, 345 mµ emission in KCl:Pb and 302 mµ absorption, 365 mµ emission in KBr:Pb are attributed to 3 P 1 – 1 S 0 transitions perturbed by surrounding host lattice ions. The excitation to 1 P 1 state does not manifest any dstinct emission which is different from the case of Tl activated phosphors. The near ultra-violet emission suffers violent thermal quenching at room temperature, and the activation energies of these nonradiative process are found to be 0.28 eV and 0.18 eV for KCl:Pb and KBr:Pb, respectively. Several discussions using a single configuration coordinate model are given.
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